MSC is a mutli-season paint. I used to apply two coats (one gal per coat) on my 33 footer on the Chesapeake and get two seasons out of it. 1.5 gals sounds about right for 25 ft.for two coats and you won't have to paint next year. You can use the leftover half gal if any touch up is needed next year.

Before the first coat, wipe the booth down with 216 cleaner and paint. Put the second coat on the next day. Good luck.

Why not use a multi season paint. I like West Marine PCA gold. You should be able to cover your boat with less than 1 gallon. You want to lay it on thin. I used to put 1 thin coat of Micron on my 35' boat every year. Used only one gallon. T.he last thing you want is to get build up of paint.

I'll 2nd the WM PCA paint as it is < $200/gallon. WM even runs a few sales/rebates on it in the spring which you might have already missed.
I'm cheap so I've been using the WM CPP paint for a bunch of years as a single season paint. This year I got it for $140/gallon with a $50 rebate card I'm still waiting for in the mail. This bottom paint works relatively well in the salty to brackish water of the Hudson River.
I only buy 1 gallon per year for my 27' boat. I'd estimate I get 1.75 coats out of a single gallon. I live with it because it is about twice the cost by the quart.
Feh!

The online guides say that I'll need about 1.5 gallons for a 25' boat.

The West Marine Advisor says to do 2-3 coats

Is 1.5g going to do 2-3 coats on my bottom?

At well over $200 per gallon, it seems like I'm going to get whatever 1.5g covers.

With a 16hr drying time between coats, the yard must have only done one coat last spring. It was painted Thursday afternoon and launched noontime Friday.

If they used CSC I would recommend West Marine PCA Gold. This is Pettit Ultima SR40 for less money and is Pettit's version of CSC. 1 coat and 1 gal is all you'll need because you likely still have CSC on there...

I have found PCA Gold to be excellent paint for this area, and it goes on sale every spring...

I have never needed more than a single gallon to paint the bottom of my I-28!

You are spreading the coating out to cover the bottom with a continuous film. I start with a gallon of the paint of my choice. The least expensive available with an organic solvent base. I mix it thoroughly and "extend" its volume with some xylene. I usually end up with about a gallon and a half. One of a previous year's cans holds the other half of the mix. Mix carefully, pouring back and forth between containers to insure even distribution of solids. Start rolling it on and continue until it is used up. If there is some "extra" near the end of the process add it to leading edges of keel and bow. The rudder can stand an extra coat, too. I usually still have a little left in the new can and seal it to use as next year's "mixing can".

No worries! Remember the advice is often coming from a seller of paint or services.

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